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Record 1 of 2304
The normal modes of a resonant cavity containing discrete inhomogeneities - The influence of fibril magnetic fields on the solar acoustic oscillations
External Online Source: doi:10.1086/167615
Author and Affiliation:
Bogdan, Thomas J.(High Altitude Observatory, Boulder, CO, United States)
Cattaneo, Fausto(Joint Institute for Laboratory Astrophysics, Boulder, CO, United States)
Abstract: Motivated by considerations of the interaction between fibril magnetic fields and solar p-modes, the acoustic spectrum of a cylindrical cavity filled with ideal gas in which a number of magnetic flux tubes are embedded is studied. A formalism, based on the T-matrix approach to acoustic scattering, is developed which can be used to determine the eigenfrequencies and eigenfunctions for any arbitrary distribution of flux tubes. For weak scatterers, the frequency shifts and velocity eigenfunctions are calculated using perturbation theory for the cases of a single flux tube and a random distribution of up to 100 flux tubes. The results of this 'exact' approach are used to give a critical appraisal of the predictions of theories based on some form of averaging, such as the one discussed recently by Bogdan and Zweibel (1987).
Publication Date: Jul 01, 1989
Document ID:
19890057574
(Acquired Nov 28, 1995)
Accession Number: 89A44945
Subject Category: SOLAR PHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 342; 545-557
Publisher Information: United States
Contract/Grant/Task Num: NAS8-31958; NSG-7511; NAGW-91
Financial Sponsor: NASA; United States
Organization Source: National Center for Atmospheric Research; Boulder, CO, United States
Joint Inst. for Lab. Astrophysics; Boulder, CO, United States
Description: 13p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACOUSTIC FREQUENCIES; CAVITY RESONATORS; SOLAR MAGNETIC FIELD; SOLAR OSCILLATIONS; BESSEL FUNCTIONS; EIGENVALUES; HANKEL FUNCTIONS; MAGNETIC FLUX; MATRICES (MATHEMATICS)
Imprint And Other Notes: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 1, 1989, p. 545-557.
Availability Source: Other Sources
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